Method and apparatus for optimum signal burst detection
AssigneeAerometrics, Inc.
InventorsKhalid M. Ibrahim, William D. Bachalo
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Abstract
The present invention provides a time efficient and practical method for signal burst detection. The signal is first applied to a set of linear transformations and input to a one-bit analog to digital converter and stored. The stored signal is then correlated with stored replications of sinusoidal wave forms over the range of frequencies using either a random access memory (RAM) or EPROM chip. The maximum of the correlation outputs is then compared with a selected threshold to provide a decision for the existence or nonexistence of the signal. This information is used to signal the processor to proceed with the acquisition and processing of the signal to determine the frequency and phase.
Claims44
A method for detecting bursts in an input signal, said input signal comprising burst signals and noise, said method comprising the steps of:
- encoding the input signal to generate a string of binary values reflective of the input signal;
- mapping the encoded signal to known representations of signals, said known representations of signals having precomputed values indicative of the presence of a signal;
- determining the existence of a burst signal in the input signal by evaluating the precomputed values associated with each known representation of signals mapped to the encoded signal;
- wherein the existence of a burst signal in the presence of noise may be rapidly determined with minimal computational overhead.
A method for detecting bursts in an input signal, said input signal comprising burst signals and noise, said method comprising the steps of:
- providing a set of reference signals;
- providing a set of predetermined values indicative of the presence of a burst signal, each of the predetermined values corresponding to one reference signal of the set of reference signals;
- sampling the input signal using one-bit quantization;
- mapping the sampled input signal to the set of reference signals to determine the reference signal which most closely matches the sampled input signal;
- evaluating the predetermined value associated with the reference signal which most closely matches the sampled input signal to determine the existence of a burst signal in the input signal;
- wherein the existence of a burst signal in the presence of noise may be rapidly determined with minimal computational overhead.
A burst detector for detecting bursts in an input signal, said input signal comprising burst signals and noise, said burst detector comprising:
- encoding means coupled to receive the input signal, said encoding means generating an encoded input signal comprising a string of binary values representative of the input signal;
- a memory comprising a set of known representations of signals and precomputed values indicative of the presence of a burst signal in each representation of a signal;
- mapping means for mapping the encoded input signal to a known representation of a signal;
- evaluation means for determining the presence of a burst signal according to the precomputed value indicative of the presence of a burst signal for the mapped known representation of a signal;
- wherein the existence of a burst signal in the input signal in the presence of noise may be rapidly determined with minimal computational overhead.
A burst detector for detecting bursts in an input signal, said input signal comprising burst signals and noise, said burst detector comprising:
- linear transformation means for linear transforming said input signal into an in-phase and quadrature signal;
- a one bit analog to digital (A/D) converter coupled to receive the in-phase and quadrature signal, said one bit A/D converter generating an encoded in-phase signal and encoded quadrature signal each encoded signal comprising a string of binary values of a predetermined length representative of the input signal;
- a memory comprising precomputed values indicative of the presence of a burst signal for all possible combinations of a string of binary values of the predetermined length, said precomputed values stored in the memory at addresses determinative from the encoded signal's string of binary values;
- evaluation means reading the memory at the address determinative from the encoded signal and determining the presence of a burst signal according to the precomputed value indicative of the presence of a burst signal read from memory;
- wherein the existence of a burst signal in the input signal in the presence of noise may be rapidly determined with minimal computational overhead.
Dependencies are inferred from the claim text.